A variety of quartz, Aventurine commonly forms in green, but also occurs in red, orange, brown, yellow, blue, and gray. Aventurine's colors are caused by trace elements of fuchsite, a chromium-rich variety of muscovite, as well as, hematite or goethite in an otherwise colorless quartz. These additions to Aventurine establish the different variations found within it. Aventurine gets its name from the Italian word, “a ventura” meaning “by chance”, possibly owing to its lucky discovery of Aventurine glass in the 18th Century. Colloquial stories place the discovery and name by a Murano Glass workmen, accidentally letting copper fillings fall into the molten glass, naming it, “avventurino".